I may have induced a couple of my problems. I have read that I should use Denso plugs (p/n K16PR-P11), but I used NGK-R laser platinum. I asked the parts guy for Denso, but he assured me that the NGK-R's were the same or better than the Denso's. Should I put Denso's in? Then when I replaced my IMGs, I may have over torqued them, but I cannot find a leak right now.